[LU-14093] gcc10 fails to build Lustre

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Affects Version/s: Lustre 2.14.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

/ldiskfs_extents.h:214:12: error: ‘zero_ex2.ee_start_hi’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  214 |  block |= ((ldiskfs_fsblk_t) le16_to_cpu(ex->ee_start_hi) << 31) << 1;
/home/alexey/head2/ldiskfs/extents.c:3411:34: note: ‘zero_ex2.ee_start_hi’ was declared here
 3411 |  struct ldiskfs_extent zero_ex1, zero_ex2;
      |                                  ^~~~~~~~
...
/home/alexey/head2/lustre/obdclass/llog_swab.c: In function ‘lustre_swab_update_ops’:
/home/alexey/head2/lustre/obdclass/llog_swab.c:137:46: error: array subscript 65534 is outside the bounds of an interior zero-length array ‘__u16[0]’ {aka ‘short unsigned int[]’} [-Werror=zero-length-bounds]
  137 |    __swab16s(&uops->uops_op[i].uop_params_off[j]);
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
...
/home/alexey/head2/lustre/mgc/mgc_request.c: In function ‘mgc_apply_recover_logs’:
/home/alexey/head2/lustre/mgc/mgc_request.c:1506:24: error: ‘sprintf’ argument 4 may overlap destination object ‘<unknown>’ [-Werror=restrict]
 1506 |                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
      |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...
In function ‘lfs_project_item_alloc’,
    inlined from ‘lfs_project_handle_dir’ at lfs_project.c:288:9:
lfs_project.c:72:2: error: ‘strncpy’ output may be truncated copying 4095 bytes from a string of length 4095 [-Werror=stringop-truncation]
   72 |  strncpy(lpi->lpi_pathname, pathname, sizeof(lpi->lpi_pathname) - 1);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Issue Links

• is related to: LU-14776 Ubuntu 20.04 HWE support